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Home >> Chevrolet >> 2013 >> Volt >> Repair and Diagnosis >> External Pages >> Different car >> Section 159 (Keyless Entry System And Remote Functions) >> Diagnostic Information and Procedures >> DTC B3101 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the K77 remote control door lock receiver. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 30 Ω between the low reference circuit terminal 1 and ground.
    • If 30 Ω or greater 
    1. Vehicle OFF, disconnect the harness connector at the BCM.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the BCM.
    • If less than 30 Ω 
  3. Vehicle in Service Mode.
  4. Test for greater than 11.5 V between the B+ circuit terminal 4 and ground.
    • If 11.5 V or less 
    1. Vehicle OFF, disconnect the harness connector at the BCM.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If Infinite resistance.
    3. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the BCM.
    • If greater than 11.5 V 
  5. Test for 3-6 V between the serial data circuit terminal 3 and ground.
    • If less than 3 V 
    1. Vehicle OFF, disconnect the harness connector at the BCM.
    2. Test for infinite resistance between the serial data circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the BCM.
    • If greater than 6 V 
    1. Vehicle OFF, disconnect the harness connector at the BCM, Vehicle in Service Mode.
    2. Test for less than 1 V between the serial data circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the BCM.
    • If within than 3-6 V 
  6. Vehicle OFF, disconnect the X1 and X2 harness connectors at the K9 BCM, Vehicle in Service Mode.
  7. Test for less than 1 V between the K9 BCM serial data circuit terminal 27 X2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  8. Vehicle OFF.
  9. Test for infinite resistance between the K9 BCM serial data circuit terminal 27 X2 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  10. Test for less than 2 Ω between the K9 BCM serial data circuit terminal 27 X2 and the K77 remote control door lock receiver serial data circuit terminal 2.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  11. Replace the K77 remote control door lock receiver.
  12. Verify DTC B3101 is not set as current.
    • If DTC B3101 is set as current 

      Replace the K9 BCM

    • If DTC B3101 is not set or is set as history 
  13. All OK.
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